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  2. Instrument error - Wikipedia

    en.wikipedia.org/wiki/Instrument_error

    If the instrument has a needle which points to a scale graduated in steps of 0.1 units, then depending on the design of the instrument it is usually possible to estimate tenths between the successive marks on the scale, so it should be possible to read off the result to an accuracy of about 0.01 units.

  3. Roberval balance - Wikipedia

    en.wikipedia.org/wiki/Roberval_Balance

    The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669. In this scale, two identical horizontal beams are attached, one directly above the other, to a vertical column, which is attached to a stable base.

  4. Observational error - Wikipedia

    en.wikipedia.org/wiki/Observational_error

    If no pattern in a series of repeated measurements is evident, the presence of fixed systematic errors can only be found if the measurements are checked, either by measuring a known quantity or by comparing the readings with readings made using a different apparatus, known to be more accurate.

  5. Thaddeus Fairbanks - Wikipedia

    en.wikipedia.org/wiki/Thaddeus_Fairbanks

    By allowing a wagon or railroad car to be placed on the scale, to be weighed while full and empty, the Fairbanks scale enabled accurate weighing of products and payment to the sellers. [14] Fairbanks received a patent on the platform scale, which his brothers advised him to produce and sell. [15]

  6. Calipers - Wikipedia

    en.wikipedia.org/wiki/Calipers

    The calipers in the diagram show a primary reading on the metric scale of about 2.475 cm (2.4 cm read from the main scale plus about 0.075 cm from the vernier scale). Calipers often have a "zero point error": meaning that the calipers do not read 0.000 cm when the jaws are closed.

  7. Vernier scale - Wikipedia

    en.wikipedia.org/wiki/Vernier_scale

    So for a vernier with a constant of 0.1, each mark on the vernier is spaced 9/10 of those on the main scale. If you put the two scales together with zero points aligned, the first mark on the vernier scale is 1/10 short of the first main scale mark, the second is 2/10 short, and so on up to the ninth mark, which is misaligned by 9/10.

  8. Forget weight. Why you should measure progress by non-scale ...

    www.aol.com/news/forget-weight-why-measure...

    Learn what non-scale victories are and why they work — plus, see examples of non-scale victories you can use to track your progress. To keep track of her weight loss, Melissa Paluch used non ...

  9. Mercator projection - Wikipedia

    en.wikipedia.org/wiki/Mercator_projection

    Once again, if Δφ may be read directly from an accurate latitude scale on the map, then the rhumb distance between map points with latitudes φ 1 and φ 2 is given by the above. If there is no such scale then the ruler distances between the end points and the equator, y 1 and y 2, give the result via an inverse formula: